Acceleo 3 provides an automatic system in order to migrate an existing Acceleo 2 project into an Acceleo 3 project.

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In order to launch an automatic migration from an Acceleo 2 project, right click on this project and select the Acceleo menu, then select "Convert to Acceleo MTL Projects...", finally a wizard will appear to configure the migration.

Migration Guide

Automatic migration from Acceleo 2

Acceleo 3 provides an automatic system in order to migrate an existing Acceleo 2 project into an Acceleo 3 project.
In order to launch an automatic migration from an Acceleo 2 project, right click on this project and select the Acceleo menu, then select "Convert to Acceleo MTL Projects...", finally a wizard will appear to configure the migration.